<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>

<body>
  <!-- 块元素 -->
  <h1>1111111111</h1>
  <p>1111111111</p>
  <div>11111111111</div>
  <ul>
    <li>111</li>
    <li>111</li>
  </ul>

  <!-- 行元素 -->
  <a href="">111111111</a>
  <span>2222222</span>

  <!-- 行内块 -->
  <img src="" alt="">
  <input type="text">

</body>

</html>